AD 93-05-16 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; MCDONNELL DOUGLAS DC-9 and C-9 (Military) Airplanes, DC-9-80 Series Airplanes and MD-88 Airplanes |
Unsafe Condition
Failure of the retention nut on the rudder power control valve slide assembly due to lack of a lockwire, which could result in loss of rudder control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the retention nut on the rudder power control valve slide assembly to determine if a lockwire is installed. If not installed, prior to further flight, adjust the retention nut, install a lockwire, and functionally check the valve. Alternatively, replace the lockwire with a locking tab washer per Service Bulletin 27-321 to terminate AD requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 90 days after April 23, 1993 (effective date of AD 93-05-16) for paragraph (a), or within 90 days after November 18, 1993 (effective date of this AD) for paragraph (b).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McDonnell Douglas DC-9 and C-9 (Military) airplanes listed in Alert Service Bulletin A27-327, Revision 2; DC-9-80 series and MD-88 airplanes listed in Alert Service Bulletin A27-317, Revision 2, where the rudder power control valve has not been modified per Service Bulletin 27-321.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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